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Tags: Physical environment + Birds

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  1. Effects of grackle damage control techniques in citrus on nesting success of non-target species

    Contributor(s):: John H. Rappole, Wan R. Tipton, Arlo H. Kane, Rafael H. Flores

    Several techniques were tested to reduce the damage caused by great-tailed grackles to citrus in the lower Rio Grande Valley of southern Texas: monofilament line, eyespot balloons, pyrotechnics, and grackle nest removal. Ten species were found nesting in the treated groves, but only the mourning...

  2. Evaluation of moderate and low-powered lasers for dispersing double-crested cormorants from their night roosts

    Contributor(s):: James F. Glahn, Greg Ellis, Paul Fioranelli, Brian S. Dorr

    The double-crested cormorant (Phalacrocorax auritus) is the primary avian predator on the southern catfish industry, estimated to cause $5 million in damage per year. To date, the most effective strategy for alleviating cormorant depredations in areas of intensive catfish production is...

  3. Developing a strategy of predator control for the protection of the California least tern: a case history

    Contributor(s):: Peter H. Butchko, Maynard A. Small

    In recent years, predation has been determined to be a seriously limiting factor in the reproduction of the endangered California least tern (Sterna antillarum browni) at many of its nesting colonies. Among them is a major colony at Camp Pendleton Marine Corps Base near Oceanside, CA. Early...

  4. Progress on managaing cattail marshes with Rodeo® herbicide to desperse roosting blackbirds

    Contributor(s):: George M. Linz, David L. Bergman, William J. Bleier

    In August and September 1989 and 1990, we aerially sprayed 8 cattail (Typha spp.) marshes with Rodeo® herbicide to begin evaluating its use for fragmenting dense cattail stands used by roosting blackbirds (Icterinae). Treated marshes were effectively eliminated as roost sites for blackbirds....

  5. Avian vacuolar myelinopathy: a newly recognized fatal neurological disease of eagles, waterfowl and other birds

    Contributor(s):: John R. Fischer, Lynn A. Lewis, Tom Augspurger, Tonie E. Rocke

    Since 1994, wildlife biologists and wildlife health specialists have worked to determine the cause of avian vacuolar myelinopathy (AVM), a neurologic disease of bald eagles (Haliaeetus leucocephalus) and other birds. The causes of morbidity and mortality in wildlife typically are determined...

  6. Hazards to wildlife associated with underground strychnine baiting for pocket gophers

    Contributor(s):: Paul L. Hegdal, Thomas A. Gatz

    Under an Environmental Protection Agency (EPA) contract, we evaluated the hazards associated with strychnine baiting for pocket gophers (Geomys bursarius) with the burrow-builder. On the Sherburne National Wildlife Refuge, Minnesota, we treated 662 ha (1638 acres) with 0.5 percent...

  7. Madam saga- an approach to an animal damage problem

    Contributor(s):: William D. Fitzwater

    While human tinkering with the zoogeographical distribution of lower animals sometimes pays dividends, more often it opens up Pandora's box. Such is the case of the Weaver Finch family. This group of birds is characterized by its colonial habits, granivorous appetite which often counters man's...